United Nations. Economic Commission for Europe, Sliggers, J., & Kakebeeke, W. (2004). Clearing the air: 25 years of the Convention on Long-range Transboundary Air Pollution. United Nations.
Chicago Style (17th ed.) CitationUnited Nations. Economic Commission for Europe, Johan Sliggers, and Willem Kakebeeke. Clearing the Air: 25 Years of the Convention on Long-range Transboundary Air Pollution. New York: United Nations, 2004.
MLA (9th ed.) CitationUnited Nations. Economic Commission for Europe, et al. Clearing the Air: 25 Years of the Convention on Long-range Transboundary Air Pollution. United Nations, 2004.
Warning: These citations may not always be 100% accurate.